Aioftp

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- client: fix parsing `ls` modify time (60)
- all: add python3.7 support (`__aiter__` must be regular function since now) (76, 77)
Thanks to `saulcruz <https://github.com/saulcruz>`_, `NickG123 <https://github.com/NickG123>`_, `rsichny <https://github.com/rsichny>`_, `Modelmat <https://github.com/Modelmat>`_, `webknjaz <https://github.com/webknjaz>`_

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- client: more flexible `EPSV` response parsing
Thanks to `p4l1ly <https://github.com/p4l1ly>`_

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- server: fix ipv6 peername unpack
- server: `connection` object is accessible from path-io layer since now
- main: add command line argument to set version of IP protocol
- setup: fix failed test session return zero exit code
- client: fix `download`-`mkdir` (issue 68)
- client/server: add initial ipv6 support (issue 63)
- client: change `PASV` to `EPSV` with fallback to `PASV`
Thanks to `jacobtomlinson <https://github.com/jacobtomlinson>`_, `mbkr1992 <https://github.com/mbkr1992>`_

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- server: fix server address in passive mode
- server: do not reraise dispatcher exceptions
- server: remove `wait_closed`, `close` is coroutine since now
Thanks to `yieyu <https://github.com/yieyu>`_, `jkr78 <https://github.com/jkr78>`_

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- client: ignore LIST lines, which can't be parsed
Thanks to `bachya <https://github.com/bachya>`_

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- client/server: add explicit encoding
Thanks to `anan-lee <https://github.com/anan-lee>`_